Rotary cut-off valve.



No. 677,370. Patented my 2. |901.

c. PIGUET.

ROTARY CUT-OFF VALVE.

(Application med Nov. 12, 1900.`

(No Model.)

. [Wwf M lINiTnD STATES PATENT OFFICE@ CHARLES PIGUET, OF LYON-VAISE,FRANCE, ASSIGNOR'TO LA SOCIT PIGUET & CIE., OF SAME PLACE.

ROTARY CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 677,370, dated July 2,1901.

Application filed November 12,1900. Serial No. 36,295. (No model.)

To a/ZZ whom 15 may concern.-

Be it known that I, CHARLES PIGUET, a citizen of the Republic of France,residing at 2 Rue de Paris, Lyon-Vaise, in the Republic of France, haveinvented a new and useful Iniproveinent in Rotary Cut-Off Valves forElastic Fluid Under Pressure, ot which the following is a specification.

This invention relates to a supply system by means ot independent diskspossessing continuous rotation. It is applicable to all motorsaerostatically operated by an elastic fluid under pressure acting on apiston or dia phragm.

Referring to the accompanying drawings, Figure l illustrates a verticalsection on the lines A B C of Fig. 2 of a motor-base provided with thissupply system. Fig. 2 shows a plan view of the motor-base with thesupply organs removed. Fig. 3 shows a plan of the disk regulating theadmission of the motive power. Fig. e shows a plan of theadmission-disk. Fig. 5 shows a plan of the emission-disk- Referring toFigs. l and 2, a represents (by way of example) the base of a cylinderof a piston-motor. This base is pierced at intervals by the ports orinlets b. The outlet-passages c discharge through ports d on theinterior surface of the base and conduct the motive uid into an annularreceptacle c. A fiat diskf, Figs. l and et, pivoted at g, slides on theexternal surface of the base and receives continuous rotary motion fromthe inotor-shaft ofthe machine-for instance, by aid of an intermediateshaft h with cone-gearing and the gear-wheels ij. The wheelj is keyed onthe axle 7o, which shaft carries'with it in its rotation the disk f. Thedisk Z, Figs. 1 and 5, which is shown convex, but which may also be dat,spherical, or cylindrical, as may also the diskf, can revolve upon theinternal surface of the base. The said disk, like the diskf, is pivotedat g and revolved by it continuously when the same rotates. The twodisks are therefore independent, but revolve on the same axis X Y.Aspring m tends to press the disks together. The disk Vfis pierced atintervals by the ports n and the disks l in like manner by the ports 0.The number of ports Zis equal to that of the It is likewise equal to theproporports o.

tion existing between the number of revolutions of the motor-shaft andthat of the disks. Thus in the drawings are shown six ports to eachdisk. In this case the disks :revolve six times slower than the shaft.This very considerable reduction in the number of revolutions of thedistributing-disks has the advantage ot reducing their speed, andconsequently the friction. Combined with the independence of the twodisks it constitutes the fundamental characteristic of the invention.

The number of ports in the base a is equal to or less than that of thedisks. The motor fluid which is contained in the chamber-p keeps thedisk pressed upon the base a and reaches the cylinder as soon as theports n of the disk f uncover in their rotation the ports b of the base,It is obvious that this period must coincide with that of the admissionto the motor-that is, that it must begin when the motor-piston is nearits dead-point with respect to the base a and that it must end when thepiston has almost reached the other end of its course. At this momentthe ports b are completely closed and the ports d about to be uncoveredby the disk Z. The motor uid, regularly admitted after having oper-1ated in the cylinder, can escape by the channels c and pass into thereceptacle e and then into the tube g to reach the receiver of theescape-forinstance, the condenser, if it be a steam-engine.

The distributerfot the admission being independent of the distributor lof the escape, the small quantity of motor iiuid which may have beenable to pass between the diskfand the base will nevertheless operateusefully on the piston instead of escaping directly or causing aninjurious counter-pressure upon the piston. Moreover, the independenceof the two disks has the further advantage that it protects theescape-disk from the high pressure on the admission-disk, and thuspermits of the reduction of the dimensions of the latter disk, andconsequently ofits friction.

Itis easy to correctly proportion the periods of admission and emissionby proportioning the size of the ports and by suitably fixing theposition of the disks on their motor-shaft. For the realization of acomplete control it ICO is, however, necessary to be able to vary theadmission. For this purpose the shutter-disk r, Figs. l and 3, whichdoes not revolve With the disks f and l, is mounted with slight frictionon the axle of the disk controlling the admission and can be adjustedangularly by aid of the rack s, either by hand or otherwise. Thisshutter is pierced by ports t, which are formed with double entrance toincrease the size of the passages and avoid the cutting of the motoriiuid. According to their positions these ports will limit the admissionperiodof the motor fluid. A.

1. In a rotary slide-valve mechanism for` motors operated by an elasticHuid, a circular casing attached to the motor an annulardischarge-chamber Within said casing, a circular central inlet-chmberWithin said casing and communicating with the source of fluid-pressure,acentral shaft supported vertically in the casing, gearing adapted torotate said shaft, an upper perforated disk loosely mounted on saidshaft, mechanism adapted to control the position of said disk, a slottedinlet-disk beneath the upper disk keyed on the central shaft and adaptedto communicate periodically with the inlet-chamber and a slotteddischarge-disk beneath the inlet-disk also keyed on the central shaftand adapted to open communication periodically with the annulardischarge-channel.

2. In a circular inclosed distributer for elastic fluid under pressure,the central shaft 7c the gear-wheel j keyed on said shaft, the pinion ikeyed on the shaft 71, passing through the casing and adapted to berotated by an outside force, inlet and outlet chambers for the pressurefluid, and a plurality of perforated disks on said central shaft adaptedto control the passage of the motor fluid.

3. In a circular vinclosed distributer for elastic iiuid under pressure,the circular outlet-channel e the concentric superposed supply-chamberp,the perforated ad mission-disk 1' having an upward toothed prolongation,the adjustable rack s engaging with said toothin g, the revolvingslotted admission-disk f in contact with the disk r and the slottedescape-disk Z maintained by spring-pressure in contact at its centerwith the concentric disk f.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES PIGUET.

Witnesses:

L. HEYNAT, M. VAcHoN.

